A boulder in the Churchyard of Down Cathedral marks the legendary burial place of "The Apostle of Ireland."

Originally commissioned as a sculpture to reflect the history of Belfast's red-light district, the final sculpture has been banned from Belfast public land.

It was once nicknamed "the most bombed hotel in Europe."

A beautiful medieval bridge allegedly constructed by the Devil.

Follow the original medieval paths that wind through this intriguing section of the city.

The Birthplace of the Englishman who founded the A.C. Milan football club.

A spooky juxtaposition of caves and graves gives this legend-filled cemetery a particularly haunting vibe.

This unchanged Victorian park is rumored to have been the inspiration behind Peter Pan's Neverland.

An engineering error ensured this cavernous 350-foot-long subterranean thoroughfare was never used as intended.

The oldest inn in England served brew to the crusaders.

The English Civil War began right here in 1642.

A 15th-century former coaching inn forms the implausibly grand entrance to a 1980s shopping mall.

These 90-year-old murals of local kings, Vikings, and outlaws hide in plain sight in a beautifully baroque shopping arcade.

When it came to designing his own small office building, the eccentric architect wasn't afraid to show the world what he could do.

Over the centuries, this island paradise has done it all, from providing monks with ecclesiastical respite to sheltering an exiled Leon Trotsky.

One of the largest wooden constructions in Europe was meant to be a casino, but soon became an orphanage.

The legendary luxury train passage is commemorated with a charming museum inside its former eastern terminus.

A gorgeous, Gaudí-esque stairway constructed in the city of Istanbul by a prominent Jewish family.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

The ornate miniature mansions were built for Istanbul's feathered residents.

An Art Nouveau gem hides beneath the layers of city grime obscuring this once-magnificent building.

A sixth-century Byzantine cistern hidden below a modern carpet store.

A tiny park in the middle of some big power politics.

Ancient serpentine sacrifice holder that has stood the test of time.